1981729151 has 8 divisors (see below), whose sum is σ = 2189532384. Its totient is φ = 1784062720.

The previous prime is 1981729069. The next prime is 1981729153. The reversal of 1981729151 is 1519271891.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1981729151 - 2¹⁰ = 1981728127 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1981729153) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2533790 + ... + 2534571.

It is an arithmetic number, because the mean of its divisors is an integer number (273691548).

Almost surely, 2^1981729151 is an apocalyptic number.

1981729151 is a deficient number, since it is larger than the sum of its proper divisors (207803233).

1981729151 is a wasteful number, since it uses less digits than its factorization.

1981729151 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5068401.

The product of its digits is 45360, while the sum is 44.

The square root of 1981729151 is about 44516.6165717926. The cubic root of 1981729151 is about 1256.0726692558.

The spelling of 1981729151 in words is "one billion, nine hundred eighty-one million, seven hundred twenty-nine thousand, one hundred fifty-one".